Loading a log with multiple dumps causes thread indexes to be too high

[kog]

If you have two dumps, each with 230 threads in them (just happened to do this today), you'll get both dumps listed in the UI and can switch between them. This works fine, and seems to do what you'd expect, except that the "thread index" counter is shared between both of the dumps.

When you click on the first dump you see threads 0-229, but when you click the second dump you see threads 230-459. This is a little confusing, especially since there's nothing that works cross-dump (IE: you can't click something in Dump 0 that goes to Dump 1).

This is hopefully a simple counter issue, and would involve resetting the counter between parsing dumps.